题目内容
-{-[-(-a )2-b2 ]}-[-(-b2)];
-{-[-(-a )2-b2 ]}-[-(-b2)]
=-{-[ -a 2-b2 ]}-b2
=-{a 2+b2 }-b2
= -a 2-b2 -b2
= -a 2-2b2
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题目内容
-{-[-(-a )2-b2 ]}-[-(-b2)];
-{-[-(-a )2-b2 ]}-[-(-b2)]
=-{-[ -a 2-b2 ]}-b2
=-{a 2+b2 }-b2
= -a 2-b2 -b2
= -a 2-2b2